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Thunderstorms could also trigger power cuts, with power to homes and businesses at risk.

The Met Office says: “Apart from a few showers or thunderstorms in Kent and East Sussex, the southeast will stay dry initially, but increasing heat will trigger hit-and-miss thunderstorms more widely later.

“Rain in the northwest will push into south Wales and the Midlands.”

For many, the rain will be a welcome relief for parched gardens and wilting flowers.

Water companies will also be glad of a downpour, as reservoirs around the country are running low.

Northern Ireland has had a hosepipe ban in place for nearly a month as a result of low water levels and United Utilities will implant another ban in the north from August 5.

Rain will be a refreshing change from baking sun for cracked ground and yellowing grass.

Today’s forecast sees the southeast remaining dry initially, but continuing heat will cause thunderstorms later in the day.

The Met Office has issued a yellow warning for the south-east (Image: MET OFFICE)

There will also be rain in the northwest which will spread towards south Wales and the Midlands.

Heavy showers in the southeast will continue into the evening but will ease off overnight.

Of the thunderstorms, the Met Office said: “Should they develop, in the heaviest showers some places could see 30mm of rain in an hour, which would likely bring flooding impacts particularly should this fall on an urban area.

“There would also be a smaller chance of impacts from lightning strikes.

UK weather in pictures: Dramatic lightning bolts strike Britain

Sun, May 27, 2018

Thousands of bolts of lightning lit up Britain last night in a spectacular thunderstorm.